hi! if your remote server is node.js based and you have already installed jsreport-pdf-sign and jsreport-assets in version 1.1.4 then you can just open the jsreport studio and follow the instructions in the docs https://jsreport.net/learn/pdf-sign. if your remote server is .net based then you can install the new pdf-sign using the instructions here.
After this i think you won't need to modify anything in your jsreport remote client call code, if you configure the pdf-sign options using the studio then you should be able to render the report using the same code that you have already for the jsreport remote client