Yahoo! sends over keeper or draft order data 30 minutes prior to the start of your draft. Until that time we are unable to automatically sync that information into Draft Wizard.
Please duplicate your league (by clicking on My Leagues, then clicking on Duplicate next to your league's View button) in order to create and/or change draft order data for your league.
You will then be able to alter your keeper data on the duplicate league and add keeper costs (by clicking Edit under Keepers on your league's Draft Wizard page and then assigning a draft pick or auction value).