Convert Cotton Probe ID to Gene Symbol
Your dataset was produced on a microarray. The probe IDs in the FASTA file are similar to read IDs produced from other NGS experiments like RNA-Seq. According to the workflow provided by Ensembl the first step is to align your reads to a reference. You'll only keep the reads that match the reference completely. Once the probes are aligned you'll be able to quantify the number of reads mapping to the gene that the probe was designed to attract.

I did find a file providing the database entries associated with each probe ID (one of which is the ID you provided) for the Affymetrix Cotton Genome Array.