An example of a custom genome database set up with SequenceServer can be found here.
Enter in the following sequence:
CGGCGTAAACGCCTTATCCGGCCTACAAAAATGTGCAAATTCAATAAATTGCAATTCAACTTGTAGGCCT GATAAGCGCAGCGCATCAGGCAATTTGGCGTTGCCGTCAGTCTCAGTTAATCAGGTTACAACGATTAACC CTGCAGCAGAGACAGAACCTGCTGCGGTACCTGGTTAGCTTTTGCCAACACGGAGTTACCGGCCTGCTGG ATGATCTGCGCTTTCGACATATTGGACACTTCGGTCGCATAGTCGGCGTCCTGAATACGGGACTGCGCTT
Select blastn as your blast method, check NC_000913.2.fasta as your nucleotide database and finally click BLAST!