To add an experiment, follow the below steps:

1. Click the Analytics tab on the top and select Experiments from the drop-down list.
2. On the Experiments page, click + Add Experiment on the top-right.
3. On the New Experiment dialog box, enter a name in the Name of Experiment field.
4. Click + Add Variant.
5. Enter a name in the Variant Name field and select a configuration from the Search Configuration drop-down list.
6. Under the Traffic section, adjust the slider to set a value.
7. In the Duration field, enter the number of days.
8. Click Add.