All you need to access Salesforce is a computer with a supported web browser.
Your trainer should have provided you with a student details form.
This page includes the URL you need to navigate in order to access salesforce log-ins screen of your org.
On this form you will also find a Username and Password which you can use to log-in to your personal training account. Please enter these details and press Log In.
There might be some other steps necessary to complete the log-in process. Your trainer will assist you with these steps if they’re necessary.