Scholia's information comes from Wikidata
and the English Wikipedia,
so you should add data there.
Use the
search page in Wikidata to examine if the data item you want to add is already in Wikidata.
If not, add a new data item with the
new item page on the Wikidata site.
There are a number of tools to ease editing Wikidata.
If you want to include a scientific document in Wikidata and it has a DOI, PMID or PMCID identifier
then you can use Magnus Manske sourcemd tool
(you need a Wikidata account and authorize Manske's tool to edit in Wikidata).
If you want to update some information about an author and the
author has an ORCID profile with public works,
Magnus Manske's sourcemd tool also
efficiently adds papers and authorships to Wikidata.
Why is Scholia so biased and incomplete?
Scholia's data comes mostly from Wikidata and that data is not
complete with respect to scientific articles, their authors, their
citations and their annotations.
Any scientometrics interpretation needs to keep in mind that the
statistics might be severely biased.
The data entered in Wikidata are mostly setup from other
databases, such as Pubmed Central and CrossRef. Works without
DOI are less likely to be added to Wikidata because it is more
difficult to automate the data entry. Most citations are also setup from other
databases. Articles from publishers that do not release their
citations, e.g., by participating in the initiative
I4OC, are less likely to have
their citations entered in Wikidata. Researchers without an ORCID
iD and their works publicly available on the ORCID website are
probably also less likely to be linked with their works on
Wikidata.
There are quite likely other serious biases in Wikidata.
How do I report a problem
Technical problems and similar are curated at
Scholia's GitHub issue list.
Use the search field to see if your problem is already listed or press
"New issue" to make a new issue (you need to have an account on GitHub).
Content-related problems, e.g., wrong data, may be addressed by
editing the underlying data in Wikidata.