Once on the Board, write an idea "using the "+" at the bottom of your screen :

Then, send your idea using

Once your idea is on the Board, click on it and then select the "Convert to JIRA" option.

Then, choose the project you want to attach your idea and choose the "Type" based on the types available from your JIRA project. Once you chose your "Type", click on "Convert" :

Your ticket will be automatically updated to JIRA once you view the following information above your idea (Creator, State, Type,...)

Select your ideas using the "Multi-selector" in your Board's taskbar.
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Then, once you've selected your ideas, repeat the steps above.