Q: How do I Change my surcurity questions so I can download paid apps?

Please see the  More Like This  section on the right.

See Kappy's great User Tips.

See my User Tip for some help: Some Solutions for Resetting Forgotten Security Questions: Apple Support Communities https://discussions.apple.com/docs/DOC-4551

Send Apple an email request for help at: Apple - Support - iTunes Store - Contact Us http://www.apple.com/emea/support/itunes/contact.html

Call Apple Support in your country: Customer Service: Contacting Apple for support and service http://support.apple.com/kb/HE57

 Cheers, Tom

WWhen I go on my app,e I'd and click on surcurity questions there is no link to sent a email to reset them

No reset link means that you don't have a rescue email address on your account, you will have to contact Support in your country to get the questions reset.

Contacting Apple about account security : Contact Apple for help with Apple ID account security

If your country isn't on that page then try this form and explain and see what they reply with : https://ssl.apple.com/emea/support/itunes/contact.html

When they've been reset you can then add a rescue email address for potential future use : Manage your Apple ID primary, rescue, alternate, and notification email addresses