Error in import_atac function

[EmanAbda]

young <- import_atac("GSM5723631_Young_HSC_filtered_peak_bc_matrix.h5",
'GSM5723631_Young_HSC_singlecell.csv',
'./GSM5723631_Young_HSC_fragments.tsv.gz')
when i run this code, this error appear
Error in import_atac("GSM5723631_Young_HSC_filtered_peak_bc_matrix.h5", :
could not find function "import_atac"

so what is the package i need to install to make this function work?

[hatrinht72]

In his script he already defined a function for that