When you start Arma 3 the Launcher pops up instead of hitting play, go to mods and import all the mod folders from your Arma 3 directory; select "Local mod" then locate your Arma 3 folder and select the folders you would like in the Launcher. It will be a much easier process for you now as well as in the future to simply use the default Arma 3 Launcher that is provided.
As for the latter question, I'm not sure which "main folder" you're referring to, so I'll go through the steps:
(All found in the TFAR download)
- From the compressed TFAR folder you downloaded, move the mod "@task_force_radio" into your Arma 3 Directory
- Move the "task_force_radio" under "userconfig" into your corresponding userconfig in your directory
- Go into "Teamspeak 3 Client">"plugins">"radio-sounds" (get ready to use this)
- Now access your file location for the actual Teamspeak 3 program
Should look like this:
Select "plugins" folder
Make note of "radio-sounds" , "win64.dll" , "win32.dll"
The 2 .dll files are found under the downloaded "plugins" folder we took from.
After this is complete just ensure you get in Teamspeak and follow order: Settings>plugins>check box for TFAR>close
Hope it helps.