The assumption is you have a Vimeo account (free or paid) and have loaded video(s). Log in to your Vimeo account and upload your video. When that has completed open the video.
Using the DIVI video module is probably easiest. Insert from Url option. Alternatively in Vimeo choose embed. Select Fixed and a width of 640 pixels will work well usually. Bigger is fine also. Copy the code. Log in to your website and if DIVI theme choose the page and edit text as detailed in the document under Client Updates. Choose Text as the editor and copy the code. Save and view the page. It’s very similar for most themes.