The conference abstracts will be published as a supplement in The FEBS Journal and the journal’s homepage can be found here 

Abstracts for the 40th FEBS Congress are collected in a special  issue of
The FEBS Journal – FEBS J. 282, Issue Supplement s1, July 2015, pages 1–422

A link to the abstracts supplement will appear in the ‘Recently Published Issues’ section, just below the image of the journal cover. Clicking on the link there will take the reader directly through to the published issue.