Hey there sirajshaikh,
Hope you’re well today and sorry for the late reply.
This question is generally not related to membership but rather user role capabilities. In order for user to be able to add new posts he has to have at least Author role.
You’ll find more info about user role capabilities here:
https://codex.wordpress.org/Roles_and_Capabilities
Please let me know if this helps 🙂
Best regards,
Bojan
Thanks my problem is solved ..
Please let us know if you have additional questions 🙂
Have a great day!
Cheers,
Bojan