I can not delete the spam comments on the post, the spam comments are diluted threads on my posts. How to contact moderators? And I also want to donate some BTC to my account.
Report them if they break the rules with the Report to moderator button at the bottom right of every post. Or just PM a moderator about it. Also, you could lock the thread and re-open it as self-moderated and you can remove any posts you like yourself without moderator input.
You can donate bitcoin to the forum at the top left near your profile button or purchase a Copper Membership instead from here:
https://bitcointalk.org/index.php?action=credit;promote