Please advise the make and model of phone your using, and the e-mail provider.
Ok lets start with just the whats app issue...
Are you able to access the Microsoft Store, and find Whats App?
If so when you click to download it, is this when you get an error, if so what exactly does the error say?
Please follow the instructions on the video here, and please let me know how you get on.
At what point are you being asked for a password *****?
There is no need to go to the whatsapp website.
As per the video, you are looking for a tile on the phone's menu called 'Store'
The video shows it as a blue tile with a box\present icon, but it can be any colour, I think the default is Orange.
Please let me know how you get on
Ok, let me know how you get on.
It should be downloading \ install the software, which can take 5 minutes depending on the speed of your internet connection.
There is multiple Microsoft 'portals' it may just be you havent registered properly, have a look at the Microsoft help page here.
They suggest users who have recently setup their MS account may still have to verify their e-mail address, check your BT account for an e-mail, as you may have to click on a link inside the e-mail to verify your account.
The other comments relate to the length of the password (needs to be less than 16 characters).
Please let me know how you get on.
No problem, please come back and let me know how you get on later on.
I havent heard back from you in the last day or sp, and just wanted to check if you still require assistance, I would appreciate it if you could rate the service received.