hi, i need help with html & css.

for my assignment we have to create a profile page with specific requirements.

everything is completed,

but the assignment needs to uploaded to filezilla & then onto our school account.

Once i upload & view my page the links i have created mentions "URL not found" Meaning i've referenced pages on my computer & It's not visible on the other side.

If someone can one-on-one with me I would like to see where I've gone wrong, Thank you!