Hi, can I link two accounts? I accidentally signed up with one email address on my computer & another on my phone. I'd like to merge them :)

Good to have you here, lowecharlie.

Let me share some information about your concern. 

The ability to merge them is unavailable in QuickBooks Self-Employed. You can select which one you'd like to subscribe to and cancel the other account. 

Here's how to cancel:

1. Go to Gear icon and select Billing Info.
2. Select Cancel now, then enter your feedback when prompted.
3. Select Cancel Subscription.

You can learn additional details in this article: Cancel your QuickBooks Self-Employed subscription.

I'm also adding QuickBooks Self-Employed Overview you can refer to learn more information.

If you have any other concerns, just let me know in a comment below. I'm always here to help.