need help with soft spots....please help

my hobie 16 has soft spots on the deck of the hulls right in front of the trampoline. ive heard of many methods liek drilling or just filling the hulls with foam. so could an experenced sailor help me please, im a teen who needs to fix his hobie for the summer.
the website has a fix on their support link. Delamination fix.
ok thanks for the link