When all of these steps are done check this module again.
Please check the following:
If you want to use solr with the TYPO3 site configuration:
- Your site has a page, marked as root page.
- Configure EXT:meilisearch with the TYPO3 site module.
- Check the reports module if any solr error is shown.
OR
If you want to use solr with the legacy configuration (domain record and typoscript of EXTCONF setup):
- Your site has a domain configured, please create a domain record on the root page, or configure it in "TYPO3_CONF_VARS|EXTCONF|solr|sites|###rootPageId###|domains"
- Your site has a page, marked as root page.
- Your page has included the solr typoscript configuration.
- You've initialized the solr connections in the backend with the menu item "Initialize solr connections"
- Afterwards please check if the reports module is showing any errors.