Casio EX-Z50

Hi,

I honestly am digital camera impared and own a Casio EX-Z50. Until,
recently my pictures were flawless and beautiful. Lately, they are the
complete oppsite I think I make have messed up my settings and pixals
can be seen throughout all my photos. How can I fix this? Please, if
you can I help... I will need- step by step instructions!

THANKS SO MUCH!