After creating an experiment in Dispatch, you can indicate you started running it by clicking on "Start experiment" in the upper-right corner of the experiment card.
Starting your experiment
When you do so you'll be asked to enter the starting and ending date of your experiment, after which it'll move to the "Running" column in your experiment overview to indicate it's running.
Tracking results on your experiment
While it's running you can keep track of your results by entering them in the "Results" section at the bottom of your experiment card. You can keep updating this as your experiment progress to keep a record of how it's going: