Whatever you do. DO NOT USE THE ALL COMMAND YET!
I did and with the wrong plugin can lock you out of needed apps like vitashell, both Molecule and vitashell. You would need to force a reinstall of henkaku to get it back, formatting the config text file all over. PLEASE use specific title ids until plugins become more stable, especially with homebrew. Other system apps like facebook, skype, netflix, hulu, psp and ps1 games will also not work and more.
Also to explain your question. like the other person already said. You have to know specifically where the plugin is, also make sure your plugin is not a system plugin and is a user plugin. You can tell by the extention. .SUPRX is user plugin. (The second letter is U meaning user. If second letter is not u, but K is system plugin, K meaning Kernel)
After that you must know where is located. you can just create a plugin folder in the UX0: partition. (Memory card) then put them there. Then you have to be very specific.
First you must know the title id of the game you wanna activate. For example, retro city rampage, is "PCSE00546" So you would have to type that with astericks like so.
You can find a list of alll your installed games title id in the UX0:Apps partition.
Under it you write the directory of where you have the plugin located. So it looks like this.
Code:
*PCSE00546
UX0:plugin/ocvita.Suprx
If you wanna activate multiple plugins, just add another one under the last one. Remember to do this for each game you wanna activate plugins for. If you wanna deactivate it, remove it or do a small edit like adding a number to the end of it or something similar. Same goes for the actual plugin file, you can just make a small edit to the name to deactivate it. It can come in handy if you have the same pulg in active for multiple games but want to disable them, rename the plug in file and they won't activate with the games. Change the text file if you just want to disable for one.
I don't think capital letters matter. But once you do that. You save the text file and then you either reload the system and enable henkaku or you just open molecule's Vitashell, press start to open options and then reload config.txt. After you do that just load the game it should work.
The plugin can be any name you want as long as the .suprx extention remains and anywhere you want, as long as you properly type the directory.