how to sew straight

i can not see the plate of measurments on my computerized sewing machine. cant keep a straight line. i purchased a device to put on my machine but after reading the box it said not for computerized sewing machines. I am new at this. this box i cant see is where you keep up with the size of the seam you are sewing. my eyes are bad. any advice?

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Raye (relache) says

6 years ago
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