Hey there,
In order to change the Blog Title, you need to enable 'Display Blog Headers' which is at Backend > EasyBlog > Settings > General > General and the 'Blog Title' field will appear. Then, you can edit it and once you finished edit it, you can disable the 'Display Blog Headers' back.
In order to remove the Blog Title, you can disable 'Append Title On Browser' and 'Append Title On Entry View' which are at Backend > EasyBlog > Settings > SEO > General.
Do take note that after you disable it, it won't have the immediate effect on the search engine and you need to wait for the search engine to reindex back on your site.