You can glue a wooden match stick vertically standing on end to a circle of cardboard (cut to fit the finder scope aperture.). Punch a small hole in the disk to provide a hole for the match shaft in the cardboard disc before you glue it with something like superglue, it only takes a few minutes to make. With the cardboad sundial in place just move the scope until there is no shadow - ie it points directly at the sun. At that point you scope should find the sun in its field of view. I hope you have a Baader safety film filter or something similiar and are aware of the dangers to your vision - standard warning for a question like yours.
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