Posting question

Click on your user name in the upper right hand part of the page when signed in. Choose the "about me" tab in the resulting page, and then add these details to your bio. information. They will then show whenever you post something.

If it doesn't work, wait until you've posted a few times. To prevent spam, some features aren't available from the get go.

I think it shows up after 5-6 posts, so you're almost there. And, welcome to the forum!

To edit your signature, make sure you are logged in to TMC.
Click on the 'Settings' item in the very top RH corner of the page.
This takes you to the page where you can edit your signature \ Avatar etc.
They should be all listed on the LHS under My profile.
If not you need to wait until you have accumulated a few more posts.
When you add your signature info it will appear in all future and previous posts.

Sid, you'll get there eventually; as Jerry mentioned we keep some features limited to deter spammers, those limit keys are also changed from time to time. We're proud that we can keep the forum largely spam-free.

Welcome to TMC, enjoy the forum!