To start off with, put your fender Starcaster on a plane and dirt free surface.
Then you have to remove the old strings from the guitar. On the top of your fender Starcaster you will find tuning pegs which by turning anticlockwise will loosen the strings and then by pulling those outwards, the strings would come out. It is advisable to you to remove 3 strings at a time.
On the back of the guitar you will find some holes which are called ferrules and in case of fender Starcaster guitars there are Tremolo Bridge. Insert the new strings from there into the holes one at a time.
Keeping the policy of one string at a time pull each string up to 2 posts from where you will use and then twist the string at a pointed angle.
Once you are done with step four, move the twisted string through the post which is corresponding to it and then twist it again from where it would go in to the post once it is pulled tight. You have to ensure that the twists would make a “Z” shape. Because when it would, it will ease in helping it go straight into the post. And once it is inside the twist it would automatically straighten up.
Don’t forget, that doing this to all the strings at the same time could be pretty problematic so make sure you don’t rush and do it one by one. Once all the strings are changed, then tighten the strings by turning the tuning pegs clockwise. In the end if you find any spare strings out on the edges then simply cut them by using a scissors. A sharp one of course!!!