Not sure about auto-renew (some people told that it is unavailable for signal subscribtion)
but it is what I found in the manual: Renew Subscription (it was described about re-new).
And there is small thread about it: https://www.mql5.com/en/forum/341830

How to Subscribe to a Signal - Trading Signals and Copy Trading - MetaTrader 5 Help
- www.metatrader5.com
If you want to copy trading operations performed by a provider , you should subscribe to a signal. A weekly or monthly fee may be charged for the...
Tim Van:
Hi there,
I would like to reach out to all of you with to following question:
If I subscribe to a signal; do I manually have to renew my signal subscription every month; or is there any "auto-renewal" option available that I could use?
Thanks for any feedback,
Best regards, Tim
There is no auto renewal option but you can renew your subscription for 1, 3 or 6 months at a time.
thanks to all for your feedback :)

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Hi there,
I would like to reach out to all of you with to following question:
If I subscribe to a signal; do I manually have to renew my signal subscription every month; or is there any "auto-renewal" option available that I could use?
Thanks for any feedback,
Best regards, Tim