In my screen shot, you see my active skin full name (with prefix) is: mdFOTMD_Nov4_2016
Yours (and your prefix) will be different. Note that MY prefix is lower case: md (stands for mountain dulcimer btw). You will want to use YOUR prefix on all new skin names that you might clone or create.
Ok so now you know your skin name prefix. Then go to your MODULES tab of the ACP (instead of the skins tab) and go to the Developer/Developer Tools module inthe left column. In Developer Tools, you'll see a buttong for Clone Skin....click it.
The "skin to clone" window should already be filled with your current active skin. (notice it doesn't show the prefix though).
UNder new skin name, fill in whatever you want to call your new cloned skin but be sure to type in the lower case PREFIX first, followed by your new skin name (and no space between prefix and name).
If I did a clone today on Nov 4, and my current active skin was titled FOTMD_Oct2_2016 , then I might call my new cloned skin: mdFOTMD_Nov4_2016 (note I've added the prefix in my new skin name....the prefix won't show in most other places you see the skin names, but you need to add it here.).
Then just hit Clone Skin and you'll see the new clone skin in your list of available skins at (yoursite).com/core/skin_admin Then all you need to do is decide which skin you want to be the current active skin for your site, check its active box and save.
I like to name clones with the date- makes it eaiser to delete really old clones I no plonger need. I try to keep at least the last two cloned skins I've saved, in case I need to go way back. But do make a fresh new Clone of your current active skin BEFORE you start making skin changes- make your tests/changes to the new Clone and test them b making it active and clearing cache. If it messes up you simply go make your original skin active again (the one you had active before you made your clone and screwed up).
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...just another satisfied Jamroom customer.
Migrated from Ning to Jamroom June 2015
updated by @strumelia: 11/04/16 01:02:11PM