These settings are configured via Settings (⚙️) → SMS.
Edit and delete a sender profile
An SMS sender profile cannot be deleted if used in an active automation or a scheduled SMS.
To modify it, hover over the relevant sender profile, and the Edit and Delete buttons will appear to the right of the row.
Edit a stopword
A stopword cannot be deleted; it can only be changed. The stopword can be edited if the organization has not had any active SMS automations or sent any broadcast SMS in the last seven days.
Click the Change button next to your stopword to modify it.