After some research I found that you were mislead by the other forum thread you posted. That was for a tutorial people from Jewelbots did to teach how to use the Arduino Gemma for wearables but it was not referring to the actual Jewelbots product. The Jewelbots product is completely different and much more advanced from the Gemma so you will definitely not be able to use your Jewelbots using the Gemma hardware definitions.
The Moteino is also completely different so you can’t use that board selection.
The picture you posted with the compiling error doesn’t show the whole error so I can’t give any specific help but it’s likely caused by trying to compile code that is not compatible with the Moteino board you have selected. Please always post error/warning messages to the forum as text, using code tags (</> button on the toolbar). If the text exceeds the 9000 character post limit you can add it as a .txt file attachment. Pictures of text are not helpful.
It turns out the “Add Personal Boards” option on https://codebender.cc/boards only shows up when you’re logged in so that’s why I couldn’t see it before. I’m not finding any documentation at all from codebender for this feature. It’s really sad that they wouldn’t make the effort to publish some documentation. Lacking any information, I’m forced to guess that this is for uploading a boards.txt file, which will require that all other dependencies are already installed on codebender’s server. Since all the other boards listed on that page are AVR-based and the Jewelbots is a nRF51822 cortex-m0 I don’t believe that will work for you. I recommend you to post to the forum thread at the “request a board” link to see what they will say.