download latest nuget.exe from the nuget site. (google it)
copy the nuget.exe in d: (any location is fine)
Use visual studio -> Package manager console.
run the below command
D:\nuget.exe push -Source "IGTelerikFeed" -ApiKey az D:\Telerik.UI.for.AspNet.Core.2020.2.617.nupkg[Note: It will ask Credential to connect to the devops when you press enter. ]