there are mobile wallets that are currently supporting bitcoin gold, you can use them to import your private keys and spend the BTG in them.
i have not done it myself but people are saying they did it easily with Coinomi wallet.
https://medium.com/@coinomi/collecting-your-free-bitcoin-gold-btg-coins-da937d4255d1
you can also see the rest of the wallets here:
https://bitcoingold.org/downloads/but i suggest not trusting anything coming out of Bitcoin Gold team meaning official wallet or the web wallets they list on their website. they have already released 2 scams (1 fake web wallet and 1 malware in their official wallet).
they are not to be trusted.