# Algorand Studio ,\[Opt in\] --\> address seems to be malformed

**URL:** <https://forum.algorand.co/t/algorand-studio-opt-in-address-seems-to-be-malformed/3937>\
**Category:** Uncategorized\
**Created:** [August 4, 2021, 1:49am UTC](https://forum.algorand.co/t/algorand-studio-opt-in-address-seems-to-be-malformed/3937 "2021-08-04T01:49:56Z")\
**Posts on this page:** 1\
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**Author:** ![danger\_dave](https://avatars.discourse-cdn.com/v4/letter/d/7cd45c/32.png) [@danger\_dave](https://forum.algorand.co/u/danger_dave)\
**Post date:** [August 5, 2021, 4:17pm UTC](https://forum.algorand.co/t/algorand-studio-opt-in-address-seems-to-be-malformed/3937/4 "2021-08-05T16:17:07Z")

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It seems the problem is that you didn’t define Alice’s account in the ’ “accounts”: [], ’  
part of 1.opt\_in.json

According to the README.md of the Github [here](https://github.com/ObsidianLabs/AlgorandStudio#transaction-template), you need to define the addresses involved in the transaction.

_Disclaimer:_ I haven’t used this software

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