I can help you with how to set up MTD in QuickBooks Online, Jacqui76.
Let me walk you through how:
From the left menu, select Taxes.
Click on " Get ahead with digital tax - Let's Go".
Before you can set QuickBooks up for MTD, you have to sign up first for MTD with HMRC. You'll receive an email confirmation from them when it's completed. Then, confirmed you have signed up for MTD.
Sign in to the Government Gateway.
Authorise MTD to interact with your QuickBooks (in HMRC Government Gateway).
Confirm MTD is turned on (You'll see the MTD logo on the screen).
I've added some resources about Making Tax Digital in QuickBooks Online for additional reference: