Well the good news is - you made it this far! Go you :)

(I'm not joking or being sarcastic here, new websites and things sometimes manage to confuse me very easily!)

With that in mind, here's some linked that might prove useful. Given that some of them are about forgotten passwords or difficulties in logging in, it might be an idea to bookmark/download them.

• How to Log In to Your Course https://support.teachable.com/hc/en-us/articles/360004257811-Log-In-to-a-Course
• If you Forget your Password https://support.teachable.com/hc/en-us/articles/219988408-Recover-Your-Account-Password
• Having Login Problems https://support.teachable.com/hc/en-us/articles/219853007-Login-Issues
• How to View Course Curriculum https://support.teachable.com/hc/en-us/articles/360004258771-Navigate-and-View-Course-Content
• Using myTeachable: Guide for Students https://support.teachable.com/hc/en-us/articles/115000359807-Using-myTeachable-Guide-for-Students
• Use the iOS App as a Student https://support.teachable.com/hc/en-us/articles/115000766167-Use-the-iOS-App-as-a-Student

There's also guidance on Payment issues...

• -- Payment Issues https://support.teachable.com/hc/en-us/articles/360004711552-Payment-Issues
• -- Purchase a Course https://support.teachable.com/hc/en-us/articles/360004257431-Purchase-a-Course
• -- Edit Your Profile and Billing Information https://support.teachable.com/hc/en-us/articles/360004256491-Edit-Your-Profile-and-Billing-Information
• -- Request a Refund https://support.teachable.com/hc/en-us/articles/360004215372-Request-a-Refund
• -- Getting Support https://support.teachable.com/hc/en-us/articles/360004214252-Getting-Support