Hello, if you are talking about the HitTable.csv file you are correct it comes with no headers, however if you download the hit table in .txt format you will get a file that has the description of the headers and the same information as the csv file:

# Fields: query acc.ver, subject acc.ver, % identity, alignment length, mismatches, gap opens, q. start, q. end, s. start, s. end, evalue, bit score, % positives, query/sbjct frames
# 41 hits found
Query_152189    S80564.1    99.310  145 1   0   1   145 59  493 8.82e-82    251 99.31   0/2

If you need the csv file still, you can add the corresponding headers with sed and only print the columns you need with awk. Don't hesitate asking if you need more help. I don't think there is a builtin option to format outputs in web BLAST.