Help reqd with Canon 550D

[Gus0898uk]

Hello Guys, I am suffering from brain fade.
I do not use my Canon 550D very often and I thought about taking some Red Arrows transit piccys tomorrow if possible. (Thurs)
When I switch the camera on, I get the settings on display on the LCD screen and not the view from the view finder.
I have pressed about everything to try and get the outside world view on my LCD screen but just have the display figures.
I believe it to be a simple mistake from me, can any member help?
TIA

[POL]

Does this help? https://www.heandshephoto.com/canon-eos ... -view.html