How do I hang plants in a bedroom window?

Here are lots of hangers. Many of these should do the trick.

https://www.amazon.com/s?k=flower+pot+hanger&crid=2KBXLLVVJKQHF&sprefix=Flower+pot+ha%2Caps%2C284&ref=nb_sb_ss_i_1_13

If you want to hang them, you will neef a hook to hang the container from. Alternatively, you could hang an additional rod across the window to hang planters from.

Traci: maybe these will help

https://www.contemporist.com/indoor-garden-idea-hang-your-plants-from-the-ceiling-walls/

https://cleverbloom.com/clever-ways-to-hang-your-plants/

You can affix a Command hook on the edge of the window or screw in a cup hook in the window frame.