360pano

Hi Just downloaded a trial version of Affinity Photo. Mainly interested in editing equirectangular images for 360 VR work. I was wondering if there is a way to precisely place guides while in the equirectangular projection mode? I need to remove the tripod and place a logo at the nadir. Only just downloaded so have only used for about 15 minutes and appears to be a very easy to use program, similar to photoshop but with a great 360 editing feature and so fast. Steve