@Eikihow
to the website on my ipad to answer to pms when im not on my phone or im using my other account on my phone.
Ive also used it on two different devices, namely a Macbook (laptop) and a Dell PC, so I know it works
When you go to the website and click on your profile pic, it collapses to show you this.
As im pointing with my stylus, there's an inbox option
So you just click on it and you'll get there.
In case you still cant find it, tell me exactly how it looks, preferably take a screenshot on your pc and I'll try my best to help you