Registration, but not account opening, must be completed prior to browsing the app.  Registration requires providing email address, password, name and telephone number (which must be verified with an SMS code).  Once that is successfully completed there is a “Skip” option that appears on the top right of the account opening screens, which, if pressed, will open the app.  It is possible to return to the account opening process at any time by attempting to execute a trade or fund the account via the features in the app.