the RISE ICO was closed,so could I changed my Signature now?
If you want to be paid for your participation, then don't change until we have paid out the Rise sig bounty.
Final Sig Spreadsheet has been made live - this is the final version (pending any minor corrections before Wednesday)
As per the blog post, from Wednesday onwards we will begin collecting information ready for distribution.
https://docs.google.com/spreadsheets/d/1rAVABvrWBejoGK6467r7HBGL_dHuqENAVwCq5jZQFpo/edit#gid=1460394335