Your question is clear enough. Trouble is that its so open-ended most people will shy away from answering.
First off I'd recommend you get Milkshape. Its not free but it doesn't cost much.
The general process is
1. Load the model into milkshape
2. Add bones
3. Assign vertices to each bone
4. Create the animation by moving bones and keyframing
5. Export the model/animation to .B3D format
6. Load it into Blitz with "LoadAnimMesh()"
You can find various tutorials on the subject here.
First off I'd recommend you get Milkshape. Its not free but it doesn't cost much.
The general process is
1. Load the model into milkshape
2. Add bones
3. Assign vertices to each bone
4. Create the animation by moving bones and keyframing
5. Export the model/animation to .B3D format
6. Load it into Blitz with "LoadAnimMesh()"
You can find various tutorials on the subject here.