BitMart provides a great support on how to set up an account on their Centralized exchange.
If you prefer a text based tutorial you can find it here
If you prefer video walk throughs you can find them below:
How To Register a BitMart Account
How To Set up Two-Factor Authentication (2FA)
How to Complete Identity Verification (KYC)
How to Deposit Assets to BitMart
How to Withdraw Assets from BitMart
How to Trade on BitMart Spot
How to Contact BitMart Customer Support