Welcome @rosindabow. Since you’re new here, follow these instructions so you can gain the ability to PM.
Once you’ve done that, send a PM to @BFD_Drew and explain that your FXpansion and inMusic email addresses are not the same and you want to merge them. Alternatively, you can also try and contact either BFD, or inMusic support and explain your situation. That should fix your issue.
Just a note… you cannot register any BFD serials on your inMusic account page. Any BFD products get registered through the License Manager only. Your inMusic page will display your products, but you cannot add serials to it. A little confusing, but that’s what it is.