Your options with regards to updating your budget vary based on the channel.

Integrated channels do not require any manual updates, and as a result, do not enable editing.

To update a non-integrated channel, where manual budget updates are required, follow these steps:

Step 1: Under Plan, go to Plans Vs. Actuals

Step 2: Hover over the Actual Cost cell of the channel you’d like to edit and then click on the pencil icon to its right. Edit the input to update your spend.