Open Facebook, tap 'Create New Account,' enter your details, then follow the on-screen instructions to complete registration.

Go to your profile, tap 'Edit Profile,' then update your details under 'About' and save the changes.

Key features include News Feed, Groups, Watch, Marketplace, and Messenger, accessible from the main menu for social connection and content discovery.

Tap the 'Groups' tab, then select 'Join Group' or 'Create Group,' follow prompts, and customize your group settings accordingly.

Use the 'Watch' tab to browse videos or live streams. Tap on any to view and interact with comments or reactions.

Access 'Marketplace' from the menu, browse listings, or post your own by tapping 'Sell Something' and following the instructions.

Facebook generally offers free basic features; for specific paid features, go to Settings > Payments or Subscriptions to manage options.

Most features are free, but optional advertising or business tools may involve payments. Check Settings > Payments for details.

Try refreshing the app, clearing cache in Settings > Apps, or reinstalling the app from your app store.

Go to Settings > Help & Support > Report a Problem, describe your issue, and submit it for assistance.