Using the secondary button of the mouse, click on Send to SQLMapper, as follows:

To limit the parameters to test, go to the Injection tab and enter the parameters, separated by commas, and click on the Run button.

SQLMap will be launched and, if any of these parameters are vulnerable, SQLMap will detect and exploit the injection. When SQLMap detects that you are exploiting a Blind SQL injection, it will ask you to continue. Just press Y.