The information block is part of the core OJS install. You could create a custom string using the custom locale and use that along with your additional item that you wish to add.
You would want to be mindful of keeping any changes up-to-date as you go to upgrade, and make sure your customizations do not interfere with any changes to to this plugin.
@rcgillis, Thank you for your reply.
I modified the code within the given page, but the title tab “For Reviewers” doesn’t show up with the other 3 tabs (For Authors, For Readers, For Librarians). However, when I type the url link …/information/reviewers the page does exist with only “Information for Reviewers” title!
I spoke with a colleague of mine who suggested the following workaround that hadn’t occurred to me:
“One workaround would be to use a custom block to add an additional block for reviewers or replace the information block completely.” - this may save you from having to customize the Information block plugin and avoid the messiness that sometimes comes with having to maintain changes to a customized code.
Yes, adding a custom block sounds a good idea. I added a new custom block contains “For Reviewers” together with the other 3 titles on the sidebar, and disabeled the default Information Block, and it works great, appreciate your help @rcgillis, thank you!