How to adjust the screen of samsung hitron CB21A5 by remotcontroll ?

Check the screen voltage. Adjust it to a little lower and check. Check the supply voltage to its video output stage [CRT base card]. If this voltage is less than normal, this kind of fault can occur. Check the smoothing capacitor [the electrolytic capacitor of low capacitance value] is bad. If it is bad, the voltage stated above will go low,and the retrace lines will be visible. Check these.
The fault you now see is technically called vertical retrace lines with picture. The above said are the main causes for this.
If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. Surf the site with patience.
http://electronicshelponline.blogspot.com/ Pull up older posts.

test this steps and fix it. God bless you

1. Make sure all power cords are connected.
2. Try pressing the enter/play key.
3. Make sure the TV is turned on and the input is set properly.
4. Make sure the TV source is set properly on the TV (This is probably done on the screen; Check your TV manual).

Yes, you change your channel to '00' or go up to '101' and then press up button on tv then it will automatically comes to '00'

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No. If it's cable, the cable operator is responsible for your channel line up.

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