Create a Color Matte (right-click in Project window, New Item -> Color Matte..) - you'll be prompted for the color after hitting Ok. Then drag the matte to your timeline and make it the bottom-most track.
Please be so kind and send me a screenshot of the first step and where exactly I have to "right-click". Sorry, I am quite new to Premiere Pro. Thanks so much!
I'll make it even easier. Go to File -> New -> Color Matte.
Thanks for clarifying, because the preivous answer was rather unhelpful.
Hello, I keep trying to change my background colour, whilst clicking new, colour matte and changing the colour to white, pressing ok, it comes up on my left, but when I try to drag it onto my timeline it does not let me. I have tried multiple times but I am not getting anywhere. Please help! x
Post screenshot of UI.