How can I change a player's jump power by using a variable?

local playerName = OykkoIsBack
Players.(playerName).Character.Humanoid.JumpPower = 100

so I want to set my jump power to the variable that has the players name? im new to roblox scripting and this happened in my output

Expected identifier, got '('

something similar to this happened i wrote this if game.Workspace.IntValue.Value = 0 then print("Value is 0") but i figured this out by adding a another = but this time i can't figure it out so i need someone to help me! really appreciate it if you could help me!

Ok well, First we're going to save a text inside the variable "playerName", This text will be the player's name

local playerName = "OykkoIsBack"

Then we will build a path to the Players folder, obviously doing "game.Players" Then we're going to use the variable, since we aren't starting the line with the variable, we need to use [ ] so the variable works correctly, like this

local playerName = "OykkoIsBack"

game.Players[playerName]

Now we successfully have a path to the player, now we just go inside the character, humanoid and set their Jump Power to what we want

local playerName = "OykkoIsBack"

game.Players[playerName].Character.Humanoid.JumpPower = 100

Yet, I like setting both JumpPower and JumpHeight to 0, just in case, IDK why but yeah...

local playerName = "OykkoIsBack"

game.Players[playerName].Character.Humanoid.JumpPower = 100
game.Players[playerName].Character.Humanoid.JumpHeight = 100