Help upgrading my plan from self employed to essential - hit a problem

Hello , I tried looking in the search part and I need to upgrade my plan from self employed to essentials after meeting with my accountant recently.

Now I tried to follow advice from a similar question posted but it appears I have created a new business rather export my info from my current self employed to essentials and now have two accounts / businesses.

Can anyone help me? I thought I was fairly tech savvy but clearly I'm an idiot. Thanks in advance

Barry