That depends what the model is.
If you want to move the whole model, expand the model and look under bones, copy the bone name that branches to all the other bones.
right click your character animation and hit new>bone sequence
name the new bone sequence the bone name you copied (this isn't nessicary in newer brawlbox modsets, you can just paste translations in the model previewer and this is done automatically)
now preview the model and expand all the side menus
on the top, make sure the bone checkbox is checked
on the left, select the bone, and on the right, select the animation.
on the bottom, the 2nd box on the right tells the number of frames, change it to whatever you want, but keep in mind brawl runs at about 60 fps
we'll assume you added 100 frames, for example. Make sure the first box on the right is at frame one and set everything to where you want it on the bottom right menu. Translations will move your model up and down, side to side, and forwards and backwards on their respective axises.
rotations change the rotation (lol) and scale changes size.
once you set values in those, you'll notice that the box becomes yellow. This means its a keyframe or keyvalue. The rest of the frames will interpolate off of these frames or values. to set everything as a keyframe, you can simply hit copy at the bottom right, and then paste.
now you can go to frame 100 and set different values there. brawlbox will change the values of the frames inbetween 1 and 100, with interpolation according to those keyframes and any keyframes inbetween.
here's a better tutorial on animating
http://forums.kc-mm.com/index.php?topic=8045.0What MrDarkSide said is for characters, and those bones will move the entire model
bone names vary from character to character but they all have TransN + HipN I believe
bone names for stages also vary.
