Hello tmcdowell,
You hace to edit account_home.tpl (yourdomain.com/templates/your_template/account_home.tpl) look around line 99 to 116 you will find this code:
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<!-- IF session.can_upgrade_account -->
<!-- IF session.group_id == settings.regular_member_group -->
{lang:"home","account_free"}
- <a href="{virtual_path}{ifelse:settings.fancy_urls,"1","account/upgrade/","index.php?m=account_upgrade"}">{lang:"home","upgrade"}</a>
<!-- ELSE -->
{member_group_name}
<!-- IF session.expiration_date --><br />
{lang:"home","expiration"} {session.expiration_date} -
<a href="{virtual_path}{ifelse:settings.fancy_urls,"1","account/upgrade/","index.php?m=account_upgrade"}">{lang:"home","renew"}</a>
<!-- ENDIF -->
<!-- ENDIF -->
<!-- ELSE -->
<!-- IF session.group_id == settings.regular_member_group -->
{lang:"home","account_free"}
<!-- ELSE -->
{member_group_name}
<!-- ENDIF -->
<!-- ENDIF -->
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Change settings.regular_member_group with your member group ID
example( wach for bold number):
<!-- IF session.can_upgrade_account -->
<!-- IF session.group_id == 9 -->
{lang:"home","account_free"}
- <a href="{virtual_path}{ifelse:settings.fancy_urls,"1","account/upgrade/","index.php?m=account_upgrade"}">{lang:"home","upgrade"}</a>
<!-- ELSE -->
{member_group_name}
<!-- IF session.expiration_date --><br />
{lang:"home","expiration"} {session.expiration_date} -
<a href="{virtual_path}{ifelse:settings.fancy_urls,"1","account/upgrade/","index.php?m=account_upgrade"}">{lang:"home","renew"}</a>
<!-- ENDIF -->
<!-- ENDIF -->
<!-- ELSE -->
<!-- IF session.group_id == 9 -->
{lang:"home","account_free"}
<!-- ELSE -->
{member_group_name}
<!-- ENDIF -->
<!-- ENDIF -->
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that's all