Hmm? Those Upgrade examples I showed have no bonus effects. All they're used for is as a Requirement.
Go to your Searing Arrows ability, click Requirements, and add the Searing Arrows Upgrade to it. Now you cannot use Searing Arrows without the research.
If you want to add Effects to an Upgrade, double click one of the Effect fields and choose an Effect Type. Their names are all self-explanatory (bonus hp, bonus attack range, bonus damage, etc...). Then choose a value for it.