Problems synching my apps

[Alison Larkin]

I have used Trello on both my MacBook and iPad for some years, but not recently. While I was using them I could switch from one device to the other and everything was synched across.

I recently had a notification on my MacBook to say I hadn't used Trello for a while and it needed updating. I did update it. but I have realised I used a different email address to the iPad account. So now they won't synch. 

I tried changing the address on the iPad account but it won't accept the change because the 'new' email is already in use. I have also tried deleting the app on my iPad, and re-installing it, but it just went straight back to the old account. 

I want to be able to use all my boards on both devices. How do I get them to talk to one another again?