To edit a General reminder you need to:
Click the Edit general reminder button appearing on the right navigation bar in the Things to do in your garden window, as shown in Figure 7-6:

Figure 7-6
The General reminder(s) page appears, as shown in Figure 7-7.

Figure 7-7
Select the entry from the list that you wish to edit
Click Edit button appearing at the end of the page, as shown in Figure 7-8:

Figure 7-8
The Edit reminder page appears displaying the details of the reminder you have selected.
The page would be similar to the Add reminder page shown in Figure 7-5
Modify the details that you want to change.
Click Save.