Go to Canon's website and download the manual: HERE If you have specific questions after that, feel free to come back with them. From what you say I suspect you are talking about LIVE VIEW MODE. Check the manual for that.
It is a good idea to get used to using the viewfinder, rather than the LCD at the back to shoot with, as putting the VF to your eye gives you a third point of support (that's why tripods have 3 legs, after all).
You should never format a card for a camera with a computer. THe format could be different and then the camera will not recognize the card. Always format the card in the camera.
@hexonxonx wrote:I am brand new to this camera and I just got the camera today and unfortunately I left the manual at my house that I moved from today so I don't have one.
How do I get the picture that I want to shoot to display on the screen. Right now it stays dark unless I display the menu or other settings.
Also, no matter what SD card I try in this camera it says no card in camera so I can't even format it. It's just not seeing it. I can't format it on my computer because I have a Mac.
@hexonxonx wrote:
I bought both an SD card and a CF card. Both are in the camera and working perfectly!
It's been many years since I had a camera like this. I started with photography back in high school. Took two years of photography back when film was the thing and learned how to develop and process my own prints. I had an old Pentax camera back then that had a light meter on top of it. It was good times.
I know what you mean. 
I harken back to the early 1980's when I began my journey. Then it was Canon A-1 and Nikon F3 cameras with off the film metering, which was much easier than what you experienced!
The new DSLRs are amazing units, but will take a bit of getting used to. The good news is that the basic elements of exposure remain the same. These days you can alter your ISO between individual shots. I personally set mine to change automatically for most situations: the built-in algorithm will use the lowest ISO for theTv/Av you choose - which makes things somewhat easier. Also, you can use ISO values of 6400 and not get too much noise - the latest sensors go way past that, but I tend to stick to lower values.
If you want to engage with a supportive and positive community that has some highly-skilled photographers who are happy to provide constructive feedback, and an excellent set of tutorials on digital photography (it's free).
Check your local library's on-line catalogue for an item called LinkedIn Learning. If there is a listing, that gives you free access to an otherwise costly site that contains a huge number of tutorials on all aspects and levels of photography given by skilled photographers and talented educators. Otherwise look for the same thing on Google and you get a free month's use.
