app/views/opportunities/actions/_submit.html.erb
<% if policy(@opportunity).submit? %>
<% if @opportunity.submission_adapter.submission_page %>
<li>
<a class='button small block primary' href='<%= submit_opportunity_path %>'><%= t('submit_proposal') %></a>
</li>
<% elsif @opportunity.submission_adapter.submit_proposals_url %>
<li>
<a class='button small block primary' href='<%= @opportunity.submission_adapter.submit_proposals_url %>'><%= t('submit_proposal') %></a>
</li>
<% end %>
<% end %>