You can connect to TOR Browser by following these steps.
Open the "Onion TOR Browser + VPN" application
Tap on the "TOR BROWSER" button at the top.
Wait for the browser to connect to the TOR network
You are now connected
Enter the desired website URL in the address bar which you want to open, for e.g. www.youtube.com, then tap Go.
The website will open
To open a new tab, tap the "1" page button at the bottom of the screen, then tap the "+" option, a new page will open, then use it to open a new website.