How to reference a player using a text box?

Here's the script, but I'm not sure why you are getting the player object. Either way, you can get the player object by doing this:

player = game.Players:FindFirstChild(nameOfPlayerGoesHere) 

Instead of having the function.

Here's the code anyway:

players = game:GetService("Players"):GetPlayers()

--this function gets the player object when inputed a player name
local function Name(name)
        for _, player in pairs(players) do
                if player.Name:lower() == name:lower() then 
                       return player 
                end 
        end 
end


script.Parent.MouseButton1Click:connect( function() 
        local player = Name(script.Parent.Parent.UsernameHandler.Text) 

        if player then --we found the player object 
              --change the stringValue (?)'s value to be the players name
              --this is where it was erroring because we were trying to put the player object into the stringValue instead of the player name string. 
              --making the value player.Name will fix the error
              game.Workspace.Value.Value = player.Name

              --make text the players name.
              script.Parent.Parent.Username.Text = 
              game.Workspace.Value.Value
        end 
end )