[HUDs...]

46 minutes ago, Alyona Su said:

These are invisible scripted prims the others are wearing. You can create one yourself, it's easy.

Search Market Place for "Notecard Giver" - and on the left choose the SCRIPTS category. There are many notecard giver scripts that are free.

Then, create a sphere and put a notecard and that script inside it. While you edit that sphere, go to the GENERAL tab and stretch it a bot larger, maybe twice the default size. Then right-click and choose TAKE. it goes into your inventory.

In your inventory, right-click on it and choose ATTACH TO - and choose STOMACH (as an example) - you will now se a wooden sphere attached to your stomach. Right-click on the sphere and choose EDIT. Then go to TEXTURE tab and set the transparency to 100%. Close the Edit wondow.

Now left-click on your belly. You should be offered a notecard

That is how it works.

Thank you for responding and trying to help At the risk of sounding completely retarded, I still dont quite understand lol I have a bento blow up mouth that is HUD controlled and I want to somehow attach the hud to my body so that others may click that area to control my HUD themselves... do you know how to do this?

[HUDs...]

I have seen multiple avis with floating text above their head that says click my head for different things. Also I have seen where you can click on a specific area on the body to access a HUD, like, bento blow up mouth HUD. How are these things done? 

[How to upload video clip]

 I  trying to figure out if/how I can upload video clips that I've saved from gyazo into SL. The format is mp4. I know that needs to be converted,  but I'm not sure to what. Any help would be appreciated.