Why this move matters
A budget does not stop you from spending. Seeing the number fall does. Most overspending is not a decision anyone made, it is a surprise someone found out about too late, usually when the statement arrives. In Notice you close that gap: you record what you spend, the category answers immediately, and you get to choose while there is still something to choose between. This is the move you repeat all month. The other four happen a few times; this one is the habit.
Do it in Vondo
1. Record what you spent. On the Transactions screen, choose New Transaction, then pick the account the money left, the payee, the amount, and the category it belongs to.

2. Pick the right type, because the type decides what your money does. Vondo has five, and each one behaves differently.
Expense is money going out, a purchase or a bill. It comes out of the category you choose, which is the case you will use most.
Refund is money handed back to you. It returns to the category you spent from, so a returned purchase undoes itself instead of arriving as new money.
Income is new money to budget, a paycheck or a gift. It does not touch a category at all. It lands in Unassigned, waiting for you to give it a purpose the way you did in Organize.
Transfer moves money between two accounts you already own. It is neither spending nor income, so no category moves. Paying your credit card is a transfer, not an expense: the money goes from your checking account to the card, and nothing comes out of a spending category. If you record a card payment as an expense you will double count it, once when you bought the thing and again when you paid the bill.
Loan payment is a fifth type that only shows up once you have a loan account, so it is missing from the list until you add one. It splits the amount into principal and interest for you instead of counting the whole payment as spending. Note the asymmetry, since it catches people out: a credit card is paid with an ordinary transfer, a loan is paid with Loan payment.
3. Look at that category. Spent goes up, and Available comes down by the same amount. That is the entire loop, and it is why the plan stays true instead of going stale.

4. Read the colour, which saves you the arithmetic. Green means money is still there. Grey means exactly zero, the category is fully used and nothing is wrong. Red means you spent more than you assigned, and that is the only one asking for an answer.

5. Keep going as the month moves. Record purchases as they happen, or sit down once a week and enter them together. The one that works is the one you will actually keep doing.
What you should see now
Your categories show what is left, not what you planned, and you can read your position at a glance without doing any maths. If one has gone red, that is not a failure, that is the system working: you found out while you can still act, which is the whole reason to record anything. Nothing here needs fixing yet.
You just did the N in VONDO
Next comes Direct, where you cover what went over by moving money from somewhere with room to spare.
Power tier: one purchase covering two categories? See Splitting a transaction. Same bill every month? See Recurring transactions. Paid with a credit card? That money moves to the payment category for that card instead of leaving your budget. See Credit cards.
Power tools for this step: let Recurring bills enter your routine charges, bring a backlog in from a CSV with Import and export, find any past entry with Search and filters, and prove your records against the bank with Reconciliation.