Soundfont not carrying over to posted score....

Hi, I just made a song using a soundfont, but when I post the score online, it seems as if the soundfont is not carrying over to the posted score, so when you play it, it sounds as if there was no soundfont. This also happens with font, if I change the title of a score to a different font, when I upload the score, the font has gone back to default. Can somebody help me change this? Thank you in advance.
-shugga