Is there any particular reason why you want all your posts deleted?
Your account has not posted since July 2017 and has woken up twice within that period as I can see on BPIP. You would want to verify you're the actual owner of the account by signing a message with an address that has been posted by this profile.

Moderators do not typically delete posts on request (except there's a good reason for this). If you want your posts gone, you would have to do it manually.