At this stage you already got what u need (uci number, application /file number )to create a gc key account and link your application to the account, please read through this thread as it’ll guide you in creating and linking your application to the gc key account, hope this helps
https://www.canadavisa.com/canada-immigration-discussion-board/threads/how-to-link-an-application-to-cic-account-step-by-step-instruction.619724/
Does my husband create this gckey account or me the sponsor