Wait, you've been growing the plant under an incandescent light? It's got only 4 nodes and it's a foot tall? I think you've probably got a stretchy weak plant due to the wrong lights being used. The light's probably too far away as incandescents are kinda hot. Or have you been using a compact fluro kept within a few inches of the plant?

As far as topping and tieing go, either way will work, use some twine, make a base tie above one of the bottom nodes and pull the plant to one side of the container...GENTLY don't crack the stem, just bend it, put a nail in the side of the planter and use this to tie the line off. Tie another piece of twine one or 2 nodes below the TOP and pull it in the opposite direction and using another nail in the opposite side of the planter from the first nail, tie the second line down.

If you've been using an incandescent light this whole time, it's probably better to start over with fluros, or metal halide, or high pressure sodium (These are the ONLY lights you should be using). \

Oh yeah, read and learn about what you're doing before doing it, it'll save you a lot of headaches and heartache in the long run.