To get Compass on an iPad go to the App store within the iPad
Search for Tobii Dynavox Compass
There you will see several options.
Select the free one to be used with the Trial, Subscriptions or the Professional account
Select the paid for options to install the perpetual App. There are options for a bundled app and a page set like Gateway or PODD
Once installed use your email and password you used to create the mytobiidynavox.com account to log into your account.