Actually this is incorrect. Move to the Left [Backspace] or Right [Spacebar] depending on which margin you wish to change until it beeps. You hold down [ALT] and press  M REL, then move left or right again until you get where you want, then Hold [ALT] and press either  L MAR or  R MAR.
As a side note the Manual for this Typewriter IS available at Brother's website at http://www.brother-usa.com/ModelDocuments/Consumer/Users%20Manual/UM_SX4000_EN_219.PDF
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Most of these small portable typewriters had a lot of "dual function keys". What this means is some of the keys on the keyboard will have writing on the top and on the front of the keys. The color of the writing on the keys is usually different on the front then it is on the top. So if you need to use a dual function key you have to find the "mode" or "code" key to use in conjunction with these dual function keys. For example: the left and right margin keys could be on the same key. to access the one on the front of the key you have to hold down the "code" or "mode" key while pressing the dual function key. What you should be looking for is something that says MAR REL (margin release) > If it is on the top of the key then all you need to do is press it once and then backspace through your present left margin and then reset the left margin at that point. For the right margin just space over to it and press the margin release key again and then space over to where you want the right margin and reset it there by pressing the right margin key.
To change or reset margins, the keys involved are the ALT key to the left of the spacebar, the #keys 3,4, & 5.
The ALT & '3' keys are used to bypass the set margins.
To bypass the left margin, move the carrier to the left margin. Press the ALT & '3' keys at the same time. Release them then backspace the carrier to the point the new margin is wanted. Press the ALT and '4' keys at the same time to set the new left margin.
To bypass the right margin, move the carrier to the right margin. Press the ALT & '3' keys at the same time. Release them and spacebar to the point where the new right margin is wanted. Press the ALT & '5' keys to set the new right margin.
The main thing to remember is to move the carrier to the point where the new margin is needed. ALT + 3 bypasses old margins, ALT + 4 sets the left margin, & ALT + 5 sets the right margin.
Above the number keys are words in green or blue the margin release, L. mar. and R. mar. are there return to the L. margin, press the alt key with the mar. rel. release them, backspace to the location for the L. mzr press alt and L. margin key, R. margin works the same way.