Welcome to level 4.
At level 4 you will see cmd picture with a number of code.
This code is ascii language.

The for this round is :
"Convert the number from ascii language into normal text language.

Still stuck ?
First copy the code.
The code will be :
"011101000111001001101111011010100110000101101110"

Go to :
http://www.roubaixinteractive.com/PlayGround/Binary_Conversion/Binary_to_Text.asp

Use binary decode.

You will get the answer.

Still stuck ? Click the spoiler.

Spoiler:

You already got the answer ?
Now what you need to do ?
Where you must put the answer ?
Stuck ?
Go to post 3.

Now where must you put the answer ?
"Check the page source"
You will see the clue.

Still stuck ?
Click the spoiler :

Spoiler:

Now you will see the password fill.
Enter the id and the password you got.

Still stuck ?
Click the spoiler :

Spoiler: