To remove a group of stitches from a repeat;-
Select the stitches (see Selection Tools).
Alternatively, one or more rows or charts can be selected. In that case, all of the repeats in the selected row(s) or chart(s) will be removed. If no selections are made, then all the repeats in all of the charts will be removed.
On the main menu bar, select Repeat > Remove all Repeats from Stitches in Selection.
The qualifier for a repeat or repeats can be edited by following these steps;-
Select the repeats.
The selection of the repeats will be displayed with a thin black rectangle around the repeat.
On the main menu bar, select Repeat > Edit Repeat(s).
Make the desired changes to the qualifier and select OK. The selected repeat(s) will be updated and the changes reflected in the written instructions.
Alternative sources of explanation
Find all blog posts on Repeats: https://www.stitchmastery.com/tag/repeats