Update low threshold run instructions

docs/operations/taking-data.md

@@ -70,8 +70,8 @@ from the terminal of `cmsusr`. When done without error messages, you can find re
 
 ## Taking a MiniDAQ run with given threshold
 
-To take a run with fixed threshold, first connect to [RCMS](http://cmsrc-gem.cms:20000/rcms), then create a MiniDAQ3 session or attach to a running session.
-From the RCMS interface, click on "Initialize" and "Connect".
+To take a run with fixed threshold, first connect to [RCMS](http://cmsrc-gem.cms:20000/rcms), then create a MiniDAQ3 session by clicking on "MiniDAQ3" then on "GEM_MiniDAQ_LV0_withAutomator"; alternatively, attach to a running session.
+From the RCMS interface, click on "Initialize" and "Connect". Ensure the function manager window opens.
 
 Open the [GEM calibration suite](http://srv-s2g18-33-01.cms:20400/urn:xdaq-application:service=calibration).
 In case the calibration suite page was already opened before, reload the page manually.