>>40920447I don't know if you mean a specific vertice in the model, but when a model is rigged (all those triangles with a pointy head you see) you shouldn't edit the geometry (move or create vertices around in Edit Mode) or you'll fuck up the rig
Now select a pointy triangle (called a bone) and you should be able to select Pose Mode in the same tab where Object mode is, if you move it around the geometry it is attached to will follow
Also this pic is where Frame Select is in blender 2.8
aaand i recommend this playlist to learn about animation
https://www.youtube.com/watch?v=zp6kCe5Kmf4&list=PLn3ukorJv4vvHr6RMoXrZSMVqmOKlqbBR 