You just need to specify in this field the loci. Please note that you need to use "rs" identifiers (i.e. "rs76976223 rs9443445 ..."). Please note that you need to specify at least 3 loci. Please note that you can submit maximum 100 loci.
Maximal Locus Size
You need also specify the maximal distance between an SNP and a gene on the chromosome to be considered for analysis. The default value is 200 kilobases which means that any gene located within 200 kilobases from SNP (both directions) will be considered for prioritization. Locus Spider accounts for the distance between an SNP and a gene.
Treating closed loci
In case you submit loci which are very close to each other (< 200 kilobases) they would be merged and treated as one locus.