Ukelele

Nice program, but right now unusable, since it tells me "The document xx couldn't be saved. You don't have permission." I have an iMac 27" with High Sierra OS and don't understand why I don't have permission to my own, private computer. Could anyone help? I really need a keyboard layout editor!

Does anyone know how to remap a regular key to a SHIFT key? I inadvertently bought a pre-owned 2011 Macbook Pro (2.53Ghz i5, OS 10.8.5, 4Gb RAM) with an EU/UK keyboard. It works great otherwise, but I cannot manage typing as fast and accurately as usual with a left SHIFT key so tiny--especially since dislocating my left little finger. I downloaded Ukelele and remapped the "capital A with the accent" key into an additional RETURN key, solving the problem with the minuscule EU RETURN key and so many mistypes of it. I've even tried looking up the unicode for the shift key, but it literally will type the U+ etc. numbers, and NOT turn it into a shift key. It says in the manual that "we don't modify modifier keys" or something like that. But I don't want to modify IT, I just want to make another key into a shift key the same way I did with the return key. Also, but not as important, is there any way I can add a key without having to start from scratch with a blank keyboard? On the EU keyboard there's an eject key next to F12. I want to make it into the so sensible DELETE FORWARD key. I'm wanted to attach a screenshot of my modified keyboard but there's no option here I can see. I used the Ukelele Dvorak layout to start with, I believe. (I've used the Dvorak layout for over 20 years now and never get carpal tunnel or tendinitis anymore.) Any help (esp. from the Dev--I will send you $--seriously!) would greatly be appreciated. Thanks.