First find the Team by Name or HCR ID. If the Team does not exist, you have to CREATE IT.
Second, Select the Team you want to Upload the Roster by clicking on the Team's name then go to the ROSTER TAB.
Third, Select the IMPORT, a Pop Up Window will Open. From there, Drag and Drop your Roster CSV file into the Grey Area
Finally, validate the roster and select DISCARD if not accurate or IMPORT if it is.