Need how to on curtain on suspension rod?

How to ? Please re phrase your question. If you are planning on hanging curtains on a suspension or tension rod, it is difficult to find one that is heavy duty so lightweight curtains are advised. You run the rod through the top pocket of the curtain and then extend rod as much as possible. Then, applying slight pressure, press into place.

If you mean a tension rod, here is a link to help you:
Hang Curtains With Tension Rods – Twist & Fit

Now onto your second option, which is essentially a curtain rod that is applied by tension, like one of those pull up bars if you’ve seen them. They are very easy to install, and can hold much more weight than command hooks, however they have a slightly different look as they go on the inside of the window frame rather than the outside.

How To Fit Tension Rods

Fitting tension based rods couldn’t be more simple. Here are the steps:

1. Line the rod up with the inside of the window frame where you want the top of the curtains
2. Fit the curtains on the rod before you start to extend it
3. Extend the rod until it’s reaching either end of the window frame
4. Twist the rod to tighten it in place – until it’s secure enough that you can pull down with a fair bit of weight

ref:https://guides4homeowners.co.uk/windows-glass/how-to-hang-curtains-without-drilling-holes-in-your-wall/

Your curtains can be rod and pocket, just slide the rod through the pocket on the top of the curtains. You also can have a grommet system where you weave in and out of the grommet holes on the top of the curtain. Also, there can be clips to attach the top of the curtain to fit and side over the top of the rod.

There are some posts here on hanging curtains if you are interested:

https://www.hometalk.com/search/posts?filter=curtain%20suspension%20rod

One key I’ve found is that the curtains must be pretty light. The tension rods can only hold so much weight. :)

Yep I agree, every tension rod I've used could only support really light weight curtains. I've kind of given up on them for that reason and use heavier duty rods now with brackets so they won't fall down so easily.

you have to be sure the insert for the curtains are large enough for the tension rod you are using they come in all size widths- they are not meant to use with curtain rings that slide, etc.

https://www.youtube.com/watch?v=gai3BycmGgE

Here are some ideas:https://www.hometalk.com/search/posts?filter=curtain%20suspension%20rod