Vat error code

Hi All

I have recently tried a number of times to submit my vat return online, phoned HMRC a few times , finally narrowed it down to my settings in sage, basically sage is trying to send it to HMRC old system. having been guided through what to do by HMRC

Go to setting, change company preferences, pop in password then basically the make tax digital box must be ticked, mine was not, but once ticked I can not click okay to save as its to far down the page and when I click and hold to move the box up it wont stay there ( so I can see ok but as soon as I let go of the mouse it drops back down )

Any help would be great