To make the skins work with TAR you must put them in a .zip, you can also add a .bmp and a .txt that have the same name as the .zip as reference.
These file must then be put in a folder, one for skins, one for cockpits and one for terrains. (default are camuflajes, cabinas and terrenas in TAR's own folder)
You must then tell TAR where to look, open up the options section and hit browse next to the adress lines for each of the folders and find the right folder. (you can also type it in, use the full adress)
You must also specify where the files should go, switch to advanced options. Now select the folders in F2's directory where you want the files to go. Do not write the whole adress, leave out the part before the ...\Flanker2\..., otherwise TAR will dump everything int it's own folder, you must specify F2's folder seperately.
I have heard that F2 only reads from the low terrain folder so put terrains there.
Go to
Ham's site for details on renaming the texture files in 2.5.