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Immediately to the left of the wire icon are the port icons. You can right click to select between power and ground ports. Ground ports generally don’t need to be renamed, while power nets follow our Power Net Naming Standard. Since the battery voltage is variable, we will name it “VBAT”. Power ports should always face up and ground ports face down!
Designators
All components have a letter designator indicating the type, along with a number to act as a unique identifier. At this point the number will be a “?”, so to assign them all numbers, you can use Tools → Annotation → Annotate Schematics. Click Update Changes List, and then Accept Changes → Execute Changes. Once you close the panels the schematic should be annotated.
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