Connect With Redmine
Click 'Settings' on the Redmine tab to open the Settings dialog box.
By default, a connection window will be opened.
Type your Redmine URL in the URL bar. It is must begin with ‘http:’ or ‘https:’.
Then type your Redmine API key or username \ password in the fields below, as shown.
Validate Connection
Press this button to validate the entered data.
Use API access key
Select 'Use API access key' option if you want to use “API Access key” instead of username and password.
How to get API access key
Login to your Redmine account
Go to My account page
In Right column under API access key, click the show link
How to enable REST API in Redmine
“REST web service” must be enabled in your Redmine for this Add-In to work.
Login to your Redmine account as administrator
Go to Administration -> Authentication tab
Enable REST web service