Answer 1

If you keep learning (e.g. doing courses), the messaging function unlocks after 3 weeks or so. If there is a problem with the messenger, write to [e-mail].

Answer 2

Have you tried searching for previous posts with the same topic?
https://www.sololearn.com/Discuss/3285888/?ref=app

Answer 3

no, [e-mail]

use the same email address as you use for your sololearn account