Go to Cog Icon-Issues–> Issue Types–> Add Issue Types–> give issue type name as 'Change request'
Once add new Issue type "Change request" ,u can add this issue type to Issue type scheme .
after that u go to work flow schemes .
After creating w/f,Workflow schemes .
Go to work flow scheme–> under "Add work flow"–>choose 'add existing workflow'–> select work flow->
click next->Assign Issue Types to "ur workflow"..then u can see issues from that u can select the issues. plz find screen shot
I think it may be help full....
Have a read of the docs.
For this particular question, start with https://confluence.atlassian.com/display/JIRA/Associating+Issue+Types+with+Projects and https://confluence.atlassian.com/display/JIRA/Configuring+Workflow
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