We're aware of the ongoing login issue (homepage 'buttons' failing to direct), and are currently investigating the cause of the problem.
1.) Login via URL: https://www.collagevideo.com/account/login
Account details and order history can be accessed here: https://www.collagevideo.com/account
You can bookmark these pages for convenience.
2.) Logging in at checkout
We appreciate your patience. Please contact us if you require further assistance. We're happy to help.