Should you need to link your existing Frontier account to your Steam account, please follow these steps:
Step 1: Open Elite Dangerous via the Steam client. You will be greeted with two options, 'Link Account' or 'Use Existing Account'. Please click on 'Link Account' this will open up a page in your browser.
Step 2: Once you have chosen this option, please enter the original email address and password that you used when first creating your Frontier account on the page that you are brought to.
Step 3: After doing this you will be brought to the account approval screen where you just need to click approve, and your accounts will be linked!
After clicking 'Approve' on this screen, you will be brought to a page that will redirect you to open the launcher. On the launcher, you will be logged in and be able to click 'Play' and launch the game!
If you require more help, please see the images below, noted to correspond to each step.
If you experience any issues with this process, please do send in a ticket to our Customer Support Team via the button at the bottom of this page and the support team will be able to assist you further.