The words 'Issue X' are automatically hyperlinked to issue X. That is, if you wish to provide link to issue X while entering comments in issue Y in the same project, just type the words "issue X" as a part of your comments. Once the comments are submitted the words, 'issue X' are automatically hyperlinked to issue X in that project. The words that get hyperlinked are:
REMEMBER: Do not misspell the word 'issue' Do not use any thing in between the words issue and X. For example: