Please note that before you can submit an abstract, you will need to register in Indico, the conference management system. When clicking on "Submit new abstract" you are automatically transferred to the Indico log-in page. The Indico account registration (only for abstracts) and the LLRF workshop participant registrations are technically independent of each other. You can register in Indico and submit your abstracts before you register to the LLRF workshop as a participant and vice versa.
Find the detailed guidelines here: https://indico.psi.ch/event/12911/page/2284-abstract-paper-submission-guidelines