Click on the hamburger menu and you will see the second last option of the menu, which is Settings.

Go with the Settings and you will find Job option on the settings list.

Select the Job and you will see the Job settings on your screen.

Click on the Job Type/Services.

Now Job Type/Services Settings screen will open with Job Type/Services list and the Add Job Type/Services Button on the top right.

Clicking on Add Job Type/Services button will open a pop up.

Within the pop up, you will see the two fields.

Fill the Type/Services field, It is mandatory. And the service cost field.

After filling both the fields, click on the Save button.