To perform the opertaions we need your youtube account access. So start providing your account permission to this plugin to get started with the magic.
Upon login your subscription will be listed in the left side pannel. You can select multiple channels. You may unselect the channel by clicking it twice.
You can see the green buton with label "Start from here" when you hover on the video item in the video list in rght side column of addon. On clicking this button will select all the videos from the start of the list to this button's video.
To remove the video you can use the remove button. This button will only appear on selectd videos and behave similar to the Green button. This button will unselect all the videos starting from the first selected video to this button's video. For removing the single video you may use corner cross button.
In the right side you can see the currently selected video count. If you are satisfied with your selection then click on the confirm button to start the process.
Upon clicking the confirm button action will start and you can see the progress status in place of confirm button.
Great your video have been added to watch later list. Now You can visit the youtube in your brwoser and check your watch later list.