Details of how to upload your thesis to White Rose eTheses Online (WREO), is available on the Research & Innovation pages Here: http://www.shef.ac.uk/ris/pgr/code/etheses-faq
The University of Sheffield is a member of EThOS and coordinates its eTheses services with EThOS. Through EThoS the British Library aims to present a single point of access to all UK produced eTheses.
You can search for digital copies of eTheses from the University of Sheffield, University of Leeds & University of York via WREO or use EThOS to search all UK doctoral etheses available. DART provides access to many European doctoral theses.