Well, many manufacturers have made running apps from a SD card not possible. Even if you are running Android "Marshmallow", which is the version that supports changing the SD card from "External" to "Internal" storage. Now the info you read is for individual apps to move, and of course only if that app can be moved. However you would have needed to set up the SD card to allow for the change (mentioned before) to move most apps. I am including that info here as well. If yours will not allow for this change (or you are running less than "Marshmallow") then there is no way to run the apps from the card.
To free up space you would then need to move things like photos, videos, music, etc., over to the SD card. Which can free up a lot of...