stacks . vcf . admixture , structure extract data from vcf ?

Question

[csag6433]

Hi . i have a .vcf file from a radseq project and i would like to do an admixture or structure analysis but i dont understand how i can extract the SNP information from the vcf to do further analysis . the vcf alone should contain all the info i need for this ?

[Pierre Lindenbaum]

what is "the SNP information" ?