How to set up call forwarding .

I have googled and the TMO page that i found …well the instructions don’t jive with what i find in my account,( no “how to ‘ tab/link) : https://www.t-mobile.com/support/plans-features/calling-services

Call forwarding Call forwarding allows you to forward your incoming calls to another number. You can set it up to forward all your calls immediately. Or, you can set it up to forward if you don’t answer the call, if your phone is turned off, or if you’re out of signal range. Be aware of the following when using call forwarding: You can’t forward calls to international numbers. You can only forward calls to 10- or 11-digit numbers. Forwarding while roaming depends on the host country’s network capabilities. For steps on call forwarding: Go to the Devices page. Select your phone. Scroll down to the How Tos section and select Calling & Contacts. Select Block and manage calls for your device. Follow the steps for setting up call forwarding for your device.

i also found another (no TMO ) page that indicated that it can be setup using the following: https://www.answeringlegal.com/blog/set-straight-call-forwarding-t-mobile-cell-phone/How to set up call forwarding on your T-Mobile cell phone: Follow these simple steps!

Step 1: Using the keypad on your cell phone, dial **21* (do not press call yet.) Step 2: After dialing **21*, enter the 10 digit telephone number you would like your calls forwarded to. Step 3: Then press #. Step 4: Press call and listen/look for a success message from T-Mobile.

but i am afraid to attempt that in case it screws something up.

any other insight?