There are various methods to edit indicators settings once the indicator is already on the chart and if you are using a standard default indicator you can simply double click your mouse on the indicator itself, but if you are using a custom 3rd-party indicator that you have downloaded then you may need to take a different approach.
Custom Indicator Settings
If you are using a custom indicator and you have already attached it to the chart, but now would like to make some changes, one option is to right click your mouse anywhere on the chart, choose objects list -> indicators and then click your mouse on the name of the indicator as shown below.
