macOS Sierra: Drag and drop problems

Hi everyone, I just recently updated my MacBook Pro (17-inch, early 2011) software to Sierra. This is after a lot of notifications from Mac that kept asking me to update. So I did.

Everything is fine and I kind of loving the features that came with it including the iCloud thing. ( I am not very smart about computers ) . But despite all the goodness, who knew that the thing that is causing me problems right now is the drag and drop functions. I can't use it.

It's not just for a specific app or browser, but this occurs for everything. I just cant use it. I clicked and tried to drag but nothing happens. I thought it was a setting/preference feature that I havent turned on or something, but i cant seems to find the option for it.

so can anybody provide me with solutions to this? is it something about this new OS that i dont know about? or is it maybe a problem with the hardware (trackpad) ?

Your assistance is very appreciated.

Thank you.