How can we use asks what method we have for doing something. The question word how comes first, then the modal can, the subject we, and the verb use. How can we use this tool to fix the shelf? In a direct question, can always comes before we.
How can we use this old ladder in the garden? Someone holding the ladder is asking what practical job it could do, like reaching apples or holding pots.
How can we use the survey results to plan next year? A team meeting question: the results exist, and the group wants a method for putting them to work.
Do not confuse this with the statement order how we can use. In a direct question the modal comes first: How can we use the budget? In a reported question the modal follows the subject, and can usually becomes could: They asked how we could use the budget. Same idea, different order and form.
A close neighbour is how could we use, a more hypothetical or polite variant, as in How could we use the attic if we cleared it out?
The yes/no form works the same way, with the modal before the subject: Can we use your printer? This is informal, and the answer is yes or no rather than a method.