First of all, some background. Every GO term has several components, including at least:
+ #GOTermName
+ unique #GOTermIdentifier: prefix 'GO:' and 7 digits
+ definition
+ aspect: #CellularComponent, #MolecularFunction, or #BiologicalProcess
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When a novel #MolecularFunction or #BiologicalProcess is published our network of #biocurators usually find it-but we highly encourage authors/researchers to contact us about their novel research, or even if they find errors/omissions in the #GeneOntology (mistakes happen!) 2/4

Use either https://go.princeton.edu/cgi-bin/GOTermFinder or https://www.yeastgenome.org/goTermFinder, choose an aspect (#biologicalprocess, #molecularfunction, or #cellularcomponent), and submit OR modify first by uploading a background list, excluding certain #evidencecodes, or other options.