I have a set of parkour animations that i bought. I’ve been trying to add them to the thirdperson character but i am new and have no idea how to. Please help 
You need to learn how to retarget animations. Here is a tutorial from the unreal engine website: https://docs.unrealengine.com/latest/INT/Engine/Animation/RetargetingDifferentSkeletons/.
If you need video tutorials, you can search for animation retargeting on youtube and you should find many tutorials.
Thank youuuuuu