The phrase "righthand corner" is used to describe the part of something, like a page or screen, that is located on the right side and in the corner. Full definition
What does the gold star at the upper righthand corner of the «Comments» line mean? (remonline.com)
Another nice feature is that, as you surf the Web, content can be shared quickly via e-mail, Facebook or Twitter using a mini-tool bar at the very bottom righthand corner of each Web page. (lawyerist.com)
Tap the plus sign in the lower righthand corner of the home screen to let potential matches know what you feel like doing. (datingsitesreviews.com)