...
Go to the "Budget" module and press the "show/hide labels" button:
...
The button "Edit tagslabel" will appear, click on it:
...
Here you can also delete labels later by right-clicking on the labels and pressing delete.
...
To see/select tagslabels, make the "Labels" column visible in the budget view. To do this, open the selection of columns and put a checkmark after the "Labels" line:
...