I do have adminstaror rights, so it is not that is not the problems, the keyboard also freezes after I have done the last command, but i can use the menu(copy and Paste) ?
It's the password of your current login (assuming the current active login has admin privileges).
It's normal to not see any characters appear in the terminal when typing in the password, it will just display "Password:" and verify the password after you hit enter. Check the screenshot for what it should look like (please notice the third line):
Open System Preferences and find the Users & Groups item.
Look under the Current User section. That is the user you are currently logged in as, and it will be the item selected by default.
Look at the right hand section, is the "Allow user to administer this computer" option enabled, i.e.; is there a tick mark against the option? If there is not then this could explain things. You need to have administrative permissions to use the 'sudo' command, and if that tick box isn't enabled, you're not an admin.
Click the padlock icon, it will pop up an authorization dialog, it should automatically filly out the username with the current user's name. If you just click the "Unlock" button, what happens? If it just shakes, then enter your password into the password field and click Unlock and see what happens.
Ok i did the above and I administrator, I did also click on the padlock button and did came for password it unlocks the settings.
But i tried to change my password save and restart the labtop and tried the hole thing one more time.This time it did accept the password but know it comes with this error: command not found.??
PS I am holding new year the next two days with my family and I will not answer your post in this period, but you can still make post and i will answer it in the new year.
If it comes back with the error "command not found" while entering "sudo /Applications/PlexConnect-master/PlexConnect.py" and it did ask for a password, then it's most likely that "/Applications/PlexConnect-master/PlexConnect.py" doesn't exist. This makes me wonder if you extracted the downloaded folder and dragged it into "Applications". Can you verify and confirm you performed this step?