If you want to save other things too, dont use the text manipulator object, it doesnt designed to this kind of job.
You can use the hashtable, array, binary, ini or the file object(or python of course.)
I don't know much about the binary object, so I won't suggest to use that(but this isnt mean its not perferct for your problem.) I usually using the array and\or the hashtable, lets just say you want to save the player's name and the current level(if the game isnt linear it's a bit more complicated, but you can figure it out if you get the main idea.)
So, the hashtable. It's working with "keys" and "values", this means you can save variables under named strings, like "player1name"(key) - "joxer"(value). In the profile menu you can get the profile names like this(if you have 10 profiles for example - of course you don't know how many profiles will be on the player's computer, but you can limit it):
+ System: For "profile_names" from 1 to 10
-> Text: Set text to Text.Text + NewLine + HashTable ("player" + str(LoopIndex) + "name")
Now you have every user name. You can save the data the same way, just use an another key. "player1level" - 5, from this you will know that player1 is completed the first 5 level, and so on.
If you don't understand how the event works:
System: For "profile_names" from 1 to 10 - this will start a loop 10 times
Text: Set text to Text.Text - you have to check the existing data, or you will only see the last one
NewLine - this one just adds a new line to the end
HashTable ("player" + str(LoopIndex) + "name") - the syntax of getting a value from the hash is this: hash's_name(key_name), we know that the our usernames are in this format: "player" - slot number - "name", so we'll looping through every possible solution(from 1 to 10), and check it's value.
str(LoopIndex) - the LoopIndex function return the value of how many times the current loop was executed, at the first time it'll return 1, second time 2, and so on, but it's returning a numeric expression, so we have to convert it to string with the str() function.
Sorry about my terrible english, I hope you can understand me more or less.:)