This action has 2 fields, first one is for the message itself. The second one is Wallet to sign with, it is the pair address, make sure it was added in the keyring first.
Event - Signed
If the message was successfully signed, the event Signed will trigger. The signature will be available only after this event triggers.
State - Signature
The signature is a list of numbers but in text format to easily safe it in Bubble database if needed.
Demo
Find an example of this feature in the Signature workflow folder