After round 10 is complete, we will have a waiver process to fill all of your remaining roster spots. If you add a player before waivers happen, that player will be dropped back off your roster.
Once round 10 is complete, I will reset the league data on yahoo and re-enter all of the draft results. When that is completed and the draft results are finalized, all undrafted players will go onto waivers. Depending on when the draft ends it could take me 12 hrs until I have a chance to get to a computer and complete it, it can't be done through mobile app.
As a reminder, there is no benefit to try and conserve your waiver priority number during the post-draft waivers, because the number will be reset to the original post-draft order a few days before the start of the regular season.