Added how to ...?

FAQ.md

@@ -6,6 +6,7 @@ At the bottom you can find how to ask other questions, request features and repo
 ## Index
 
 * [Authorizing accounts](https://github.com/M66B/FairEmail/blob/master/FAQ.md#user-content-authorizing-accounts)
+* [How to ...?](https://github.com/M66B/FairEmail/blob/master/FAQ.md#user-content-how-to-)
 * [Known problems](https://github.com/M66B/FairEmail/blob/master/FAQ.md#user-content-known-problems)
 * [Planned features](https://github.com/M66B/FairEmail/blob/master/FAQ.md#user-content-planned-features)
 * [Frequently requested features](https://github.com/M66B/FairEmail/blob/master/FAQ.md#user-content-frequently-requested-features)
@@ -39,6 +40,13 @@ Related questions:
 * [Why is ActiveSync not supported?](#user-content-faq133)
 * [Why is OAuth not supported?](#user-content-faq111)
 
+## How to ...?
+
+* Change the account name: Setup, step 1, Manage, tap account
+* Change the swipe left/right target: Setup, step 1, Manage, tap account, at the bottom
+* Set a signature: Setup, step 2, Manage, tap identity
+* Delete an account/identity: Setup step 1/2, Manage, tap account/identity, three-dots menu, Delete
+
 ## Known problems
 
 * ~~A [bug in Android 5.1 and 6](https://issuetracker.google.com/issues/37054851) causes apps to sometimes show a wrong time format. Toggling the Android setting *Use 24-hour format* might temporarily solve the issue. A workaround was added.~~