Can't locate pressure valve for gas boiler!!

Hi all

We just moved into a new house last week, we bled the radiators without even thinking bout the gas boiler. We realised afterwards and checked, the pressure is basically zero. It's still firing up but we need to raise the pressure up again. We can not locate the valve ANY where!

It's a Worcester green star 24i only installed this year, we looked online obviously, the videos state to increase pressure there is 3 options:

1.There is either a Small blue switch inside, which we don't have.

2. you can use an internal key, there's no key or even a key hole to insert it in like it shows in the videos.

3. Lastly it could be an external valve or filler hose, we checked the hot press (that's where it was in our old house)

What else can we do?! We don't want to call a plumber for something so simple. Where else can it be?! 😭