To log in to MT5 through desktop, you need to follow these steps:
1.Download MT5 Desktop Platform from Client portal.
Client Portal 
Platforms 
Desktop Platforms 
Meta Trader 5
2. Open the MT5 trading platform on your desktop.
3. Click on "File" from the top menu and select "Login to Trade Account".
4. Enter your login credentials in the fields provided. These include your account number, password, and the server EquitiGroupLtd-Live.
5. Click on the "Options" button if you need to change any settings.
6. Click on "Login" to access your MT5 account.