Thanks for reaching out and I'm sorry for any frustrations. You can search for campaigns using the Sort function and pages:
In addition, to add contacts to an email list you'll first search for the contacts (note: you can use Advanced Search to find all the contacts with a specific criteria), then click the checkboxes for each contact, click Manage Lists and select Add to Lists:
From there, you'll click the checkbox next to the name of the email list(s) and then click Add:
I hope this helps!