Select the text in "copy" and copy it. Then press space to do it again. To decode, just encode the encoded text twice, and it will become decoded.
abcd becomes bcad Probably isn't the most efficient way to do this, but oh well. f Iouyca rnadeth s,ith n eouyof icfaliy lavh besia oc mrreoco prmheesinn of onsirutticnsogi env G.odojo b.