help with this mesh

http://prntscr.com/pcj5aq
i have seen guides but i can’t fix this issue, the character move but with that same pose.
I know it’s something about the skeleton but i dont know how to use the default skeleton mannequin to this mesh.

Most likely you haven’t assigned the animation blueprint to the character mesh.
dive in and check it.
If it is assigned, then the animations in use aren’t re-targeted.

Thanks a lot for your answer .
if it’s not too much to ask , do you know where I can find tutorials about it? I will start to google it tho.
thanks a lot !

SOLVED.

If anyone is having this issue, check this video:https://youtube.com/watch?v=4TrLiekYABY
thanks to that video guide and to MostHostLA for telling me wich things i need to dive in i managed to fix it

Thanks!!