Joomla website editing

General information for the website: blog site
Description of requirements/features: http://www.rockettheme.com/docs/joomla/templates/kraken

1. On the main home page (djedpress.com) I need to change top logo to white on black.
2. Same with non-home pages (top header needs to white against black). I have this logo and I tried uploading it didnt work and i dont know why

3. Need hyperlink on "Written anything good lately? We're looking for contributions by people of colour and we pay" text on home page and dont know how

4. for contact page (http://djedpress.com/index.php/contact) want to add "attach a file" option so someone can attach a picture (gif, jpg, jpeg, png), video, or file (word, pdf)

should take half an hour and requires only basic coding. using kraken gantry theme: http://www.rockettheme.com/docs/joomla/templates/kraken
Extra notes: http://www.rockettheme.com/docs/joomla/templates/kraken

1. On the main home page (djedpress.com) I need to change top logo to white on black.
2. Same with non-home pages (top header needs to white against black). I have this logo and I tried uploading it didnt work and i dont know why

3. Need hyperlink on "Written anything good lately? We're looking for contributions by people of colour and we pay" text on home page and dont know how

4. for contact page (http://djedpress.com/index.php/contact) want to add "attach a file" option so someone can attach a picture (gif, jpg, jpeg, png), video, or file (word, pdf)

should take half an hour and requires only basic coding. using kraken gantry theme: http://www.rockettheme.com/docs/joomla/templates/kraken