I don't know which slingshot you have, so it's hard to offer specific help.
One problem that pops up frequently, is that many tube shooters come with bands that are too short. Building your own tube sets is really easy and the best solution IMHO. But you can also dissassemble the original bands and retie them as singles or pseudo-tapers to fit your draw.

 

Another technique for using this type of slingshot it to center the tubes every time. It's easy to do by starting each draw with the the handle end point toward the target until there is enough tension on the tubes so they center themselves at the top of the ring and stay as long as the tension remains.
Sighting is pretty much the same as with flats, except the tubes certainly look different.
And welcome to the forum!

 

Get a Scout shoot flats you will be happy

 

Like KawKan said, if those are the tubes that came with it, they will be too short. You could take them down to singles with a pseudo taper but I find them fiddly to make and the life isn't that good. Either here or on the other forum is a member that makes hybrid pseudos with tube loops and flat bands to the pouch that looks interesting and seems to work well.

 

Hey, here’s a setup you can use for your tubes, called cocktail sometimes, I don’t have a DANKUNG type shooter right now, I got these tied the way you can use on the shooter you got, they draw right decent and do a good job, my draw is 34”, anyway, this is a couple I got with this kind of setup. Hey give it a try.

 

These are 1745 DANKUNG tubes

 

Thanks for the info. I finally just took off the tubes and put some flat bands in the top slots. Can actually hit the target now at least. I have diff sizes of tubing to try on a couple diff frames. I'm sure I can get them to work. Has been frustrating. Thanks again.

 

I have an Ocularis and will give that a try with a loop setup or a single tube. Thanks

 

An SPS loves tubes

 

Twist the pouch & flip the fork

 

Just draw them the way you would flat bands and shoot the way you would with flat bands. It works the same Stop thinking and start aiming. I have a similar frame Its called a Serpentine and is one of my faves wish I had more like this. Most likeley on my next order