cannot locates post tiles in domainname/series/xxxxseries name

/series-toc/ is the default slug for the series table of contents page which lists all the SERIES in your website.

However, the individual series archive pages (a page that lists all the posts in a single series) is found with the url structure of https://yoursite.com/series/some-series-name

So link 3 would be something like https://www.brainstorm.org/seires/lims/ assuming that “lims” is the slug of a series.

If that doesn’t work then:

1. You have a post/page that already has the “series” slug assigned to it.
2. You have a custom-post-type or another plugin that has already grabbed that slug for it’s use.
3. Your permalinks may need flushed. Visit the WordPress->settings->permalinks page to flush the permalinks and try again.