Hey There! Looks like you've never setup the Hollow Knight OBS Overlay before (or this is the first time since the big 2.0 release of the overlay). To get started, lets set a few things up. If you're seeing this message in OBS, take the URL for this page and go over to Chrome/FireFox/IE and go through the setup. Once done you'll be given a new URL for OBS that contains your setup.
For Page Width and Height, this should be the size, in pixels, that you normally capture HK with in OBS. Common values are 1920x1080 & 1080x720.
Next you'll be given the ability to move stuff around the page. The green border signifies the area that you'll be displaying in OBS. Icons can be moved from container to container or reordered within the container. Icons moved into the Red/Disabled container will be hidden even if you pick them up.
For more information go to: https://github.com/iamwyza/HollowKnightRandomizerTracker
Looks like you're loading in a config from the URL. This might be because you've just added the profile feature in Overlay 2.1. If so, just select profile 1.
If you're importing a layout from another runner, but don't want to overwrite your current layout, pick a profile you haven't used before.