In ResearchGate (RG), there is only one publication by you, and RG found 45 citations by other authors for this paper: https://www.researchgate.net/publication/272691651/citations. You may add more publications, so that RG canl identify more citations. See this help page for instructions: https://help.researchgate.net/hc/en-us/articles/14293005132305-How-to-add-research
Go to researchgate.net and search for your name. You will see a list of your works (I found only one so far) come up. Underneath the title of the article, you’ll see the number of “reads” and also the number of citations.
Now, if you click on the title of the work, you’ll see more detail about it.
Underneath the title, author, etc. info, you’ll see a horizontal menu. One of the items here is Citations. If you click on that, you’ll get a list of all the works that have cited your paper.
As Wolfgang R. Dick explains in his response, you can add more publications to your profile on ResearchGate, and then RG will try to locate citations to those publications.
Ellen G. Cohn is right - search for your publications that are already at ResearchGate but not yet attached to your profile. Here are three methods to find these publications and to claim authorship (see also "How do I confirm authorship of my publications to add them to my profile?" in https://help.researchgate.net/hc/en-us/articles/14293005132305-How-to-add-research):
1. Open https://www.researchgate.net/profile/Izidor-Nwokocha/unconfirmed (visible only to you). There may be a list of publications for which you may claim authorship, provided these are yours.
2. Search for your name or for the titles of your missing papers at Google, adding site:researchgate.net, e.g.: https://www.google.com/search?q=%22Izidor+Nwokocha%22+site%253Aresearchgate.net
3. Search for the titles of your missing papers at https://www.researchgate.net/search.Search.html?query=&type=publication.
- Badges
- Science topic